I've been battling this for awhile and I'm ready to hear what all y'all think of my issue.
Essentially, my bike heats up slowly ( but surely) to 400 degrees on straight aways. Doesn't need to be WOT / full variation. Itll heat up doin like 40 at part throttle as well. With this being said, it does not run STUPID HOT. I've had bikes that have run HOT AS FUCK and this doesn't fall in that category. It cools off pretty well sitting at idle, temps drop pretty consistently.
The set up: av10 / Doppler 50 cylinder / Doppler head ( squish ~1.2mm ) / some rando carbon reeds / gianelli black gun pipe / 19 oko / le Partie cdi ( 1mm timing) / er3 clutchless / Doppler clutch pulley.
I don't think it's a lean issue for a couple reasons but I could be wrong. I've had this set up mounted on two different av10 bottom ends and both did the exact same thing. None ran cooler than the other. Also I'm jetted about as rich I can right now. Take off is four strokey as fuck till the pipe starts to hit. Even with clutch pulley. It's given that with a multi circuit carb you should be able to perfectly tune it all the way through the throttle range but... with how peaky the Doppler 50 / black gun is, it feels kinda hard. I'm not sure how to jet it to rev clean off the pipe while not going lean on the pipe. Also, I've ran a 19 phbg / 21 phbg as well. Same exact shit. Also, I've sprayed the bitch down with carb cleaner.. didn't really come up with shit.
Thanks for reading that, only a bit more I promise.
I have a couple hypotheses on my issue but I'm not sure how wingnutty each one is.
1. Black gun is just too peaky for daily riding. I've heard this from a couple people and while I don't fully understand how the different cone sizes / header lengths etc would affect temps but I'm willing to consider it. I've had Doppler pipes on Peugeots and definitely have noticed a less peaky / more broad powerband. Additionally those bikes didn't have this issue.. but they were Peugeot so it's kind of hard to compare.
2. Clutch pulley ( this one would make the least sense ) but all I can think of is that it's forcing the engine to rev high even at mid range throttle / low speeds. And it's just forcing it to heat up.
3. Inadequate cooling head ( probably makes the most sense ). This has been a battle for French bikes as long as time has existed and it's worth keeping in mind. Many people who have literally my exact set up claim low ass temps but it's just so hard for me to believe. When I put a derbi head on my peugeot, it was a fuckin game changer. Dropped 40 degrees easy. I can rip that bike all day with no issues. God I wish I could say that about the Moby.
The only readily available head that I can think of that has significantly more surface area is the polini head. Admittedly it has a dome / squishband that's a total bag of ass but regardless it is one honkin thicc ass head. I know it's 70cc but I'd still consider giving it a go with a lot of dremel work to the combustion chamber etc.
The bidalot head looks absolutely beautiful in everyway but god damnit I dunno how to find one. I guess I could buy the mvt kit and steal the head off but woof that sounds expensive just for a head.
last fuckin thing, I know a lot of people just go " whatever rip it, shit just runs hot. " but I still ain't accepting it. I honestly think it's possible to build a everyday ripper av10 Moby. Yay. Dreams.
Alright that's all I got, hit me with y'all ideas / thoughts / feedback as a whole. Thanks. XOXO, Jon (edited)